@item show record full memory-query
Show the current setting of @code{memory-query}.
+@kindex set record btrace
+The @code{btrace} record target does not trace data. As a
+convenience, when replaying, @value{GDBN} reads read-only memory off
+the live program directly, assuming that the addresses of the
+read-only areas don't change. This for example makes it possible to
+disassemble code while replaying, but not to print variables.
+In some cases, being able to inspect variables might be useful.
+You can use the following command for that:
+
+@item set record btrace replay-memory-access
+Control the behavior of the @code{btrace} recording method when
+accessing memory during replay. If @code{read-only} (the default),
+@value{GDBN} will only allow accesses to read-only memory.
+If @code{read-write}, @value{GDBN} will allow accesses to read-only
+and to read-write memory. Beware that the accessed memory corresponds
+to the live target and not necessarily to the current replay
+position.
+
+@kindex show record btrace
+@item show record btrace replay-memory-access
+Show the current setting of @code{replay-memory-access}.
+
@kindex info record
@item info record
Show various statistics about the recording depending on the recording
/* A new thread observer enabling branch tracing for the new thread. */
static struct observer *record_btrace_thread_observer;
-/* Temporarily allow memory accesses. */
-static int record_btrace_allow_memory_access;
+/* Memory access types used in set/show record btrace replay-memory-access. */
+static const char replay_memory_access_read_only[] = "read-only";
+static const char replay_memory_access_read_write[] = "read-write";
+static const char *const replay_memory_access_types[] =
+{
+ replay_memory_access_read_only,
+ replay_memory_access_read_write,
+ NULL
+};
+
+/* The currently allowed replay memory access type. */
+static const char *replay_memory_access = replay_memory_access_read_only;
+
+/* Command lists for "set/show record btrace". */
+static struct cmd_list_element *set_record_btrace_cmdlist;
+static struct cmd_list_element *show_record_btrace_cmdlist;
/* Print a record-btrace debug message. Use do ... while (0) to avoid
ambiguities when used in if statements. */
struct target_ops *t;
/* Filter out requests that don't make sense during replay. */
- if (!record_btrace_allow_memory_access && record_btrace_is_replaying (ops))
+ if (replay_memory_access == replay_memory_access_read_only
+ && record_btrace_is_replaying (ops))
{
switch (object)
{
struct bp_target_info *bp_tgt)
{
volatile struct gdb_exception except;
- int old, ret;
+ const char *old;
+ int ret;
/* Inserting breakpoints requires accessing memory. Allow it for the
duration of this function. */
- old = record_btrace_allow_memory_access;
- record_btrace_allow_memory_access = 1;
+ old = replay_memory_access;
+ replay_memory_access = replay_memory_access_read_write;
ret = 0;
TRY_CATCH (except, RETURN_MASK_ALL)
ret = ops->beneath->to_insert_breakpoint (ops->beneath, gdbarch, bp_tgt);
- record_btrace_allow_memory_access = old;
+ replay_memory_access = old;
if (except.reason < 0)
throw_exception (except);
struct bp_target_info *bp_tgt)
{
volatile struct gdb_exception except;
- int old, ret;
+ const char *old;
+ int ret;
/* Removing breakpoints requires accessing memory. Allow it for the
duration of this function. */
- old = record_btrace_allow_memory_access;
- record_btrace_allow_memory_access = 1;
+ old = replay_memory_access;
+ replay_memory_access = replay_memory_access_read_write;
ret = 0;
TRY_CATCH (except, RETURN_MASK_ALL)
ret = ops->beneath->to_remove_breakpoint (ops->beneath, gdbarch, bp_tgt);
- record_btrace_allow_memory_access = old;
+ replay_memory_access = old;
if (except.reason < 0)
throw_exception (except);
execute_command ("target record-btrace", from_tty);
}
+/* The "set record btrace" command. */
+
+static void
+cmd_set_record_btrace (char *args, int from_tty)
+{
+ cmd_show_list (set_record_btrace_cmdlist, from_tty, "");
+}
+
+/* The "show record btrace" command. */
+
+static void
+cmd_show_record_btrace (char *args, int from_tty)
+{
+ cmd_show_list (show_record_btrace_cmdlist, from_tty, "");
+}
+
+/* The "show record btrace replay-memory-access" command. */
+
+static void
+cmd_show_replay_memory_access (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (gdb_stdout, _("Replay memory access is %s.\n"),
+ replay_memory_access);
+}
+
void _initialize_record_btrace (void);
/* Initialize btrace commands. */
&record_cmdlist);
add_alias_cmd ("b", "btrace", class_obscure, 1, &record_cmdlist);
+ add_prefix_cmd ("btrace", class_support, cmd_set_record_btrace,
+ _("Set record options"), &set_record_btrace_cmdlist,
+ "set record btrace ", 0, &set_record_cmdlist);
+
+ add_prefix_cmd ("btrace", class_support, cmd_show_record_btrace,
+ _("Show record options"), &show_record_btrace_cmdlist,
+ "show record btrace ", 0, &show_record_cmdlist);
+
+ add_setshow_enum_cmd ("replay-memory-access", no_class,
+ replay_memory_access_types, &replay_memory_access, _("\
+Set what memory accesses are allowed during replay."), _("\
+Show what memory accesses are allowed during replay."),
+ _("Default is READ-ONLY.\n\n\
+The btrace record target does not trace data.\n\
+The memory therefore corresponds to the live target and not \
+to the current replay position.\n\n\
+When READ-ONLY, allow accesses to read-only memory during replay.\n\
+When READ-WRITE, allow accesses to read-only and read-write memory during \
+replay."),
+ NULL, cmd_show_replay_memory_access,
+ &set_record_btrace_cmdlist,
+ &show_record_btrace_cmdlist);
+
init_record_btrace_ops ();
add_target (&record_btrace_ops);
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